Includes three grades: coarse, medium, and fine (4 of each grade). Coarse grade removes rust from metal surfaces. Medium grade restores and polishes aluminum, brass, copper, and other metals and is ideal for cleaning copper pipe/fittings before soldering or removing lacquer/varnish. Fine grade burnishes wood/metal finishing e.g. brass and is also ideal for flattening painted or varnished surfaces prior to applying wax polish. Warning: Not suitable for use on plated surfaces.